Sawmill-dog-actuating mechanism



J. M. BROPHY SAWMILL `DOG ACTUATING MEQHANISM April 19, 1927. l 1,625,240

Filed Jan. 21, 1926 sheets-sheet 1 g, f f,

, 1,625,240 J. M. BROPHY SAWMILL DOG ACTUATING MECHANISM Filed Jan. '21. 192e 2 sheets-sheet 2 Apiil 19, 1927.

Patented Apr. 19, 1927.

agire Y' F l E SAWIVIILL-DOG-ACTUATING IJEECHANISM.

Application filed January 21, 1926 Serial No. 82,819.

This invention relates to saw mill carriages, and aims to provide novel means for automatically selecting and operating the dogs of -a saw mill carriage, thereby relieving the operator of all responsibility in connection with the selecting of the dogs.

A11 important object of the invention is the provision oi' a. 'fluid pressure control means, means being provided tor actuating the fluid pressurey control means by t-he movement o' the log to its proper position on the knee blocks and knees of the carriage.

A further object of the invention is to provide a device or this character which may be readily and easily installed on saw mill carriages now in general use, eliminating the necessity of making alterations. in the usual construction to position the device.

still further object ot' the invention is the provision of a novel form of connecting means whereby the stroke of the dog actuating mechanism may be varied to meet various requirements of usage.

Another object or' the invention is the provision of a controlling valve which will be normally held in a position to hold the dogs actuated thereby, in their retracted positions.

lVith the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement ot' parts and 1n the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment ot the invention herein disclosed, may be made within the scope of what is claimed, without departing from the spirit of the invention.

Referring to the drawings:

Figure 1 is a side elevational view of a knee equipped with a dog operating mechanism constructed in accordance with the invention.

Figure 2 is a plan view of a saw mill carriage illustrating a log as having actuated the dog` controlling mechanism.

Figure 3 is an enlarged sectional view through the control valve.

Figure 4 is a sectional view through a three-way valve to be controlled by the operator.

Referring to the drawings in detail, the carriage of the device is of the usual and well known construction and embodies bolsters 5, knee blocks 6 Vand knees 7 which knees are mounted for movement longitudinally oi the knee block 6 by means of the rack and pinion shown in Figure 1.

The device forming the essence of the inyvention includes a supporting bar 8 which may be secured to a knee in any well known manner, the bar being of the angle type for purposes to be hereinafter more fully described.

Movably mounted on each knee is an actuating plate 9 which is formed with elongated openings 10 for the reception ot the pins 11 that are secured to the knee, which pins secure the plate in position against vertical movement but permit of movement or the plate horizontally.

rEhe angle portion oil the bar is formed with spaced openings for the reception of the rods 12 that are secured to the plate 9, there being provided'coiled springs 13 disposed between the plate and angle portion ot the bar to normally urge the plate outwardly to a. position as shown in dotted lines in Figure 1.

Connected with the plate is a rod 14;v which is supplied with a turn buckle 15 to permit the stroke oie the rod to be adjusted to meet various requirements and as shown, a valve indicated at 16 is carried at the inner end of the rod and is adapted to cooperate with the seat 17 in controlling the passage of fluid through the valve housing indicated at 18. A coiled spring 19 acts against the valve 1G to normally urge the valve to its seatfor preventing the passage of ifiuid to the controlling valve to be hereinafter more fully described. y

The controlling valve wnich is indicated generally by the reference character 20 is mounted on the clogging cylinder 21 which dogging cylinder is pivot-ally mounted on the knee as shown by Figure 1 ot the drawings and has communication with the valve housing 18 at one end 01"' the valve housing 20, through the medium of the hose 22 with the result that when the valve 16 has been moved to a position as shown by Figure 1, air will be admitted to one end of the valve 20.

The valve :2O is oi' a. novel construction and includes a relatively large chamber ,23 at one of its ends and a main valve chamber 2e' in which the slide valve 25 operates, the valve 25 being mounted on the valve rod 26 at one orp its ends, while the opposite end or' the valve rod supports the piston 27 operatlOO lll

fl ll ine` in the valve chamber 23 and the piston lo spaced from the piston and operating in the main portion ot the valve. its shown, the piston 2 is oi a much greater diameter' than the diameter ont the piston 28 to the end laat when l'luid pressure admitted to the chamber fl, a great volume ot liuid wil be directed to the piston 2 owing;` to the dialneter ot the piston and chamber than is normally directed lo the piston :lil with the result that the lluid pressure within the portion 2l ot the valve housing* is overcome and the valve J5 is moved to a position as illustrated hv liigure 3.

When the air pressure iu the chamber 23 is released, it will be seen that the liuid pr sure in the portion 2l, will act against the piston 28 to return the piston 2T and valve to their initial positions.

The valve is ol the slide type and is desigrued to, when nioved to a position as shown bv 'Figure il, admit tluid to the riehthund end ot the (logging c vlind-er ill, moringf the piston contained therein to the lower carl thereoi.

'lfhe pieton while not shown is carried at the inner end of the piston rod 29 in thel well known manner. which rod QS? connects with the segment lll which bolted to the usual (logging lever socliet shown at ill, and which is pivot-ally connected to the knee at :'32 with the result that as the rol 29 op crated, the clogging; lever sr'ieket is moved to operate the dogs ll through the lever mechanism shown at ill. to cause them to be retracted or extended.

As illustrated by Figure the main l'luid supply`- pipe is indicated b v the reference character which pipe is in communica` tion with the valve housing` 20 through the hose 3G, to the end that the piston 2S is normallvv held under the pressure ot the lluid within the main suppl)` tanl: not shown.

The pipe 36 which also communicates with the main source oi'l l'luid pressure supply, communicates with the valve housing 18 through the hose Il", the passage ol tlnid through the pipe 'lt being controlled b v means ol? the three-way 'valve 38 positioned within the pipe line and which valve majv be controlled by means oli the pedal positioned adjacent to the operators seat tor convenient maniijiulation.

lt might be further stated that the bolt lor connecting' the segment 30 to the dogging lever socket and `which is indicated at llO, may be positioned in either` ot the openings l-l ol the segment 230 to regulate the stroke ot' the dog operating mechanism.

The pipes 42 and l--l are in comuninication with the exhaust port ot the valve. 2U, at 4:4, and have their tree ends directed towards each other and arranged adjacent to the forward edge ot the knee associated therewith, so that as thcl'luid exhausts'lroln the valve EL), it will be carried to the 'lorward portion ot the knee to clear the knee bloei; ol any sawdust or any other foreign matter that may rest thereon and which might tend to prevent the log under operation beingl held squarely to the saw.

llhile l have shown and described the invention as applied to a single knee, 1t is to be understood that the several knees ot a saw mill carriage are to be supplied with automatic controlling devices as shown and described, and in connection with the operation o't the device, rel'erence will he had to litio-ure. 2 which illustrates a log as posiA tionen on certain linee blocks ot a saw mill earriage,while one knee block is clear, which condition exists while sawingrelativelyT short logs.

From this ligure it will be obvious that as the log is moved into engagement with the knees ot the carriage, the plates 9 support ed by the knees engaged by the log are lloreed rearwardl)v to a position as shown b v ligure l ot the drawings, whereupon valve member lo opened, establishing conununication between the hose 37 and hose The operator will now manipulate the pedal SS), moving' the three-way valve ilu 'o admit liuid to the hose 37 and hose whereupon fluid entiers the valve chamber 23 'torcingr the piston 2T, rod 2G and valve member to a position as shown by lligure 23, with the result that lluid passes through the uncovered passageway to the rieht-hatul end ot the. cylinder 2l, in the direction ot the arrow as shown in liigure i.

its air enters the cylinder 2l, the piston is iorced rearwardly, moving` the rod 29 and segment 3:0 to operate the dogs liihen it is desired to release the dogs, the opcrator moves the valve SS to release the 'tluid pressure in the chamber Ll, whereupon the normal liuid pressure or supply which is constantly in valve chamber 2l, will operale ou the piston ill to return the faire member to its normal position with the result il at fluid pressure within the z5/lli,

der 2l will be released and exhausted through the port lli and pipes 42 and ll-3.

lhus it will be. obvious that due to this construction, it is unnecessary tor an attcralant to watch the knees oli a sav.' mill farriag'e and operate certain mechanism to doe' a log which is positioned on the carriage, the operation oli the (logging mechanism haine` automatic and the selection oil the does to be operated. is made automatif :alljvY and instantaneously with the inissage ot the loe` to its proper position on the earruige.

l.. ln combination with a saw mill carriage and the dogs thereof, means ior aclUG liti

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' the saw mill carriage.

2. ln combination with a saw mill carriage and dogs carried by the knees thereof, means for actuating the dogs, and mea-ns actuated by the movement ot a log into engagement with the knees tor bringing certain dog actuating means into operation.

3. In combination with a saw mill carriage and the dogs carried by the knees thereof, pneuma-tically controlled means for actuating-the dogs, and m-eans controlled by the movement ot a log against the knees of the saw mill carriage for actuating certain pneumatic dog actuating means.

d. A saw mill carriage including a plurality of knees, dogs carried by the knees, fluid pressure actuating means for actuating the dogs, valves for controlling the passage or' luid to the fluid pressure actuating means, and means controlled by the passage ot al log onto the carriage to engage the knees for operating the valves to actuate the dogs carried by the knees engaged by the log.

5. In combination with a saw mill carriage and the dogs mounted on the knees thereof, means for actuating the dogs, and work controlled means tor causing the operation ot certain dog actuating means.

G. A saw mill carriage including a plurality ot' knees, dogs mounted adjacent to the knees, Huid pressure actuating means for actuating the dogs, valves for controlling the passage ot fluid to the dog actuating means, and means actuated by the movement of a log moved onto the knees for operating the fluid controlling means.

T. A saw mill carriage including a plurality of knees, dogs mounted on the knees, i'luid pressure control means for actuating the dogs, means controlled by the movement of a log aga-inst the knees for bringing certain lluid pressure control means into operation to operate certain dogs.

8. A saw mill carriage including a plurality of knees, dogs mounted on the knees, means for operating the dogs, means responsive to the movement ot the log onto the carriage for permitting the dog actuating means to be operated.

9. A saw mill carriage including a plurality of knees, dogs mounted on the knees, independent means for actuating the dogs ot each knee, and means lying in the path ot travel ot a log passino' onto the carriage, and engaged by the log lpor cont-rolling the dog actuating means.

l0. A saw mill carriage including a plurality ot knees, dogs on the knees, Huid pressure means including a cylinder for operating the dogs ot each knee, controlling valves mounted on the cylinders for controlling the passage of Huid to the cylinders, selecting valves for controlling` the passage oit fluid to cert-ain controlling valves, and means operated by the movement of a log onto th-e carriage tor operating certain selecting valves.

1l. A saw mill carriage including a plurality of knees, dogs carried by the knees, fluid pressure controlled means lor actuating the dogs, a vertical plate carried by each knee, valves for controlling the passage Ot' fluid to the lluid pressure controlled means, and rods connecting the plates with the last mentioned valves tor operating the last mention valves when the plates move inwardly under the action ot' a log positioned on the carriage.

l2. A saw mill carriage including knees, dogs carried by the knees, Huid pressure operating means for operating the dogs, pipe lines for directing tluid to the fluid pressure operating means, controlling valves adapted to be automatically opened wh-en a timber moves thereagainst for opening certain pipe lines, and a control valve common to all the pipe lines for controlling the passage of fluid through the. pipe lines.

18. A saw mill carriage including knees, fluid pressure dog operating means carried by the knees, a movable member positioned adjacent to each knee and adapted to' be moved inwardly by the action of a log bearing against the knees, valves for controlling the passage of fluid to the luid pressure dog operating means, and means tor connecting the movable members and valves to operate the valves upon movement of the movable members.

lll. A saw mill carriage including knees, dogs car 1ied by the knees, fluid pressure operating means for operating the dogs and carried by each knee, a valve associated with each Huid pressure operating means for controlling the passage of fluid thereto, a controlling valve common to all the fluid pressure operating means for controlling the passage ot lluid thereto, and means controlled by the action ot a timber moved to engage the knees tor opening certain valves to allow Huid to pass into the fluid pressure operating means associated therewith.

ln testimony that l claim the foregoing as my own, l have hereto aiXed my signature.

JAMES M. BROPHY.

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